Where two rivers meet at a confluence there exists a mixing zone. A mixing zone may be very large and extend for many miles as in the case of the Mississippi and Missouri riv… See more

The geology that underlies a river or lake has a major impact on its chemistry. A river flowing … See more

Oxygen is probably the most important chemical constituent of surface water chemistry, as all aerobic organismsrequire it for survival. It enters the water mostly via diffusion at … See more

The majority of rivers on the planet and many lakes have received or are receiving inputs from human-kind's activities. In the industrialised world, many rivers have been very seriou… See more